const express = require('express');
const bodyParser = require('body-parser');
const typeorm = require('typeorm');
const app = express();
const port = 3000;

// 引入 reflect-metadata，这是 TypeORM 的依赖
require('reflect-metadata');

app.use(bodyParser.json());

// 连接到数据库
typeorm.createConnection().then(connection => {
  console.log('数据库连接成功');
  
  const weightRecordRepository = connection.getRepository('WeightRecord');

  // 添加体重记录
  app.post('/api/weight', async (req, res) => {
    try {
      const { date, weight, unit } = req.body;
      const weightRecord = weightRecordRepository.create({ date, weight, unit });
      await weightRecordRepository.save(weightRecord);
      res.status(200).send('体重记录成功');
    } catch (error) {
      console.error('保存体重记录失败:', error);
      res.status(500).send('保存体重记录失败');
    }
  });

  // 获取所有体重记录
  app.get('/api/weight', async (req, res) => {
    try {
      const weightRecords = await weightRecordRepository.find({
        order: {
          date: 'DESC'
        }
      });
      res.status(200).json(weightRecords);
    } catch (error) {
      console.error('获取体重记录失败:', error);
      res.status(500).send('获取体重记录失败');
    }
  });

  app.listen(port, () => {
    console.log(`后端服务运行在 http://localhost:${port}`);
  });
}).catch(error => {
  console.error('数据库连接失败:', error);
});